Please refer my previous article to learn more about SharePoint Designer 2013 Workflows.
In this blog you will see how to use “Find Substring in String “action in SharePoint Designer 2013.
Description:
Finds a particular substring inside of a string and returns the index of the substrings’s starting position.
Note: The index value in Microsoft SharePoint Designer 2013 is zero-based.
In this example, I am trying to find a substring “Anand” from “Name” field and storing the index of the substring’s starting position in “index” integer variable and updating the current item “Notes” field to display the index value.
Workflow Design:
Result: